Detent mechanism



April 13, 1937.-

C. A.A MACOMIC DETENT MECHANISM Filed sept. i5, 1935A 5 sheets-sheetl ffy/Vigas:

April 13, 1937. c. A MAcoMlc DETENT MECHANISM Filed sept. 13, 1935 5 SheetsfSheet 2 April 13, 1937. C. A. MACQMIC, V2,076,584v

' DETENT MECHANISM Filed sept. 13, 1935 5 sheets-sheet 5 April 13, 1937,.

c. A. MAcMlc; 21,076,584

DETENT MEoHANgsM v Filed sept.l 13; 1955 5 sheets-sheet 4 PYE 13, 937 c. A. MAcoMlc l 2,076,584

DETENT MECHANISM Filed sept. 15K; 1935 5 sheets-sheet 5 Patented Apr. 13, 1937 Ars-r OFFICE DETENT MECHANISM Chester A. Macomic, Chicago, Ill., assignor to Macomic Corporation, Chicago, Ill., a corporation of Delaware Application September 13, 1935, Serial No. 40,427

17 Claims.

My invention relates to detent mechanisms adapted for use in connection with pattern setting machines and the like, and especially adapted for use in` connection with line and type casting and type setting machines.

Among the objects of my invention are to provide a driving connection means adapted to be associated with a plurality of separate driven members, all driven from. the single moving element and so disposed that separate driven members may be released' and locked in released position with a minimum of resistance. Other objects of the inventionare to provide a specially sensitive andfpositive detent mechanism. Other objects of the invention will appear from time to time in the speciiications.

My invention is illustrated more or less diagrammatically in the accompanying drawings wherein- Figure 1 is a side elevation, of an apparatus embodying my detent mechanism;

Figure 2 is a front elevation of the mechanism shown in Figure 1;

Figure 3 is a plan view of the machine shown in Figure 2';

Figure 4 is a longitudinal section through the nachine, showing the detent in the driving posiion;

Figure 5 is a similar section showing the detent about tobe released and the movable member about to be locked in place;

Figure 6 is a similar view showing release complete; the movable member being locked in posiion;

Figure 7 is a side view showing the detent at the end of the stroke and about to be re-engaged;

Figure 8 is` a similar section showing the detent again engaged on the return movement;

Figure 9 a section along the line 9-9 of Figure 2 illustrating the parts near the end of the return 1stroke and about to be reset for the driving posiion;

Figure 10 a perspective of the serrated bed along which the detentmechanism travels;

Figure 1l a section through the bed.

Like parts indicated by like characters in the specication and drawings'.

I have illustrated my invention as applying to a lineV or type casting or type setting machine, but it will be entirely obvious that the mechanism mightl be satisfactorily usedin connection with a largev number of devices wherein single elements are driven in' unison by a movable member and release-cl therefrom selectively, tol be later. picked up upon the-return movement of the driving member; and where in the specification and claims I use language directed to type setting and type casting1 Want it understood that such language is used for purposes of illustration, not to narrow the intent of my invention, which is broad enough to cover any device where such detent mechanism can be appropriately used.

As a practical application of my invention, it may be employed in connection with pattern setting mechanism such as is shown for example in my previous Patent 1,775,822, issued on September 16, 1930. It willbe understood that any suitable means, for examplea typewriter, may be employed to depress a pattern pin. I illustrate in Figure 6 a plurality of such pins B. Each such pin isnormally in the Withdrawn position in which most of them are shown in Figure 6. Any suitable means, for example such mechanism asis Vshown in the above mentioned Patent 1,775,822, may be employed for depressing pins as shown for example in the depressed position B1 of Figure` 6. A practical application of my invention is to use with pattern beds in which there is a line of pins -extending longitudinally along the pattern bed, for each possible space or part of a given line of type. Assume that a page having 30 letter or letter spaces in width is required, thenA therewill be 30 parallel lines of pins B. In each line' there is a pin for each character which can be cast or set, For example, where a typewriter control isused there will be one pin, in each line` or row of pins, for each character of the typewriter. As shown in Figure 6, this pattern bed, generally indicated as B2, with its patternA pins B', overlies the below described matrix bed.

AA are side frames supporting a matrix bed, o

A1. Projecting upwardly from this matrix bed A1 are side walls A2. This matrix bed for part of its length is, as shown for instance in Figures 1 and 2, smoothv on its upper surface. Toward the other end the matrix bed is recessed and contains a plurality of serrated strips, A3, which strips are nush with the surface of the bed, and when assembled, as indicated especially in Figure ll, form across the bed a plurality of serrations A4, having curved Walls on one side, and overhanging Walls on the other, as indicated mounted for reciprocation along the matrix bed between the walls A2 adapted to travel along the surface oi the bed, and serrated strips are a plurality of matrix or type bars A5. These type bars are notched, as indicated on their under sides. If type bar takes the form of a matrix against which the character is cast, thenthose of course willxbe, found in the bottoms of the notches.

If. Qnthe other hand, theyv are type bars from which, for instance, impressions may be struck, then the impressions or characters will be found not in the bottoms of the notches,but on the ends of the lugs formed by the notches or grooves, and under some circumstances, of course, these bars instead of being continuous could be made up of a plurality of separate sections or elements in line movable longitudinally. It will be understood that there is one of these matrix or type bars in line with each of the serrated strips, although of course the bed could be formed either from serrated strips, or by notching or serrating a solid block, or even by cutting such notches across the bed itself. It will be understood, of course, that there is a matrix or type bar A for each line of pins B. As a matter of convenience, each line of pins may overlie and conform generally to the thickness and positon of the particular matrix or type bar A5. Associated with each matrix strip is a latch member A5. This latch member is located in the same plane as the strip and is pivoted thereto at its end as at A8, for movement in the plane of the strip. Each latch member carries a downwardly F extending-tooth A", adapted to engage one of the notches A4." VEach such latch has a releasing cam member A9 on one side of the pivot, and a locking cam member A on the other side of the pivot.

There projects upwardly from each matrix` strip,

immediatelyadjacent the releasing cam member Agfa lug A11,

The matrix strips A5, each with its latch A5, are aligned in parallelismv and extend longitudinally along the bed A3. The actuating means for moving Vthe matrix strips in'relation to the bed and also for locking the matrix strips'in relation to the bed, -are as follows, C VC1 indicate racks which extendalong the sides of a base A. These racks, as will be clearfrom Figure 2, are confined upwardly by the cover plates C20. Anysuitable gear or gears may be employed, not herein shown, for imparting longitudinal movement to the racks C C1 by meshing with the teeth thereof, the two racks being connected by the below describedY structure, and moving at all times in unison.

Secured to each rack is a bracket or side member C2. Slidably mounted on each of said brackets is a cam plate C3. Each such plate has a lower slot C4, shown as horizontal, and an upper cam slot generallyY indicated as C5. The cam slot has an intermediate horizontal section C5, an upper end horizontal section C", a short lower end horiggntal section C8, an inclined portion C9 connecting C5 andC8 and an inclined portion C10 Y connecting C5 and C2.. VIt will be understood that the opposite end of the desired movement, as

shown for example in Figure 7. Mounted also on the matrix bed A1, but out of line with the stops C14 C15, are two upwardly extending lugs or pins C C1". These two pins C175 C1'I are spaced apart both longitudinally andrtransve'rs'ely. They `are clearly seen for example in Figures 1, 2 and 9.

Each bracket C2 has also upwardly offset dog engaging membersl DD20, positioned one at each endof each bracket, as is clear for example from Figure 1. Concentrically' rotatably mounted Y to ends E2 and securing nuts E9.

the inner faces of the side plates E1.

upon each cam plate C5 are a pair of dogs D1 D2.

Each dog has associated with it one end ofthe` coil spring D3, which tends to force the dog D1 against the stop pin D4 andthe dog D2 against the stop pin D5. Figure 1 indicates the device at the beginning of a stroke, the arrow indicating the direction of the ensuing stroke. Assume that the operator moves the rack C to the left, in

the direction of the arrow, the leftjhand member D engages the dog D1 and constrains `the cam `plate C3 to movement in unison with the racks ures 1 and 2, and a corresponding abutment D10,

the plates may rotate about the axis of the pins.

The side plates E1 are connected at one end, the

left end, referring to the position of the parts as shown in the drawings,y by a transverse tie rod,

E2. Reduced ends E3 pass through the side plates E1 and receive nuts E4, whereby the assembly is held together. neled to receive a key E5, which abuts at each end against an inner face of one of theside plate members E1. Y The key E5 is channeled or grooved to receive the edges Yof a plurality of spacing plates E5. and extending through'the spacing plates E5, is an irregularly shaped tie rod El. This is reduced E10 is a key similar to E5 and also slotted to receive the spacing plates E5. v l

Rotatably mounted in the frame thus formed is the circular shaft G. It extends at one end exteriorly outwardly beyond one of the side plates E1 and has keyed thereon, exterior to such plate, a lever arm G1 provided with a cam pin G2. 'I'he shaft also carries a -key G5 extending between Laterally spaced from the shaft G and also rotatable in the side plates E1 is an additional shaft G4, also. with its key G5, its exterior lever G5 and its cam roller G". Mounted on the shafts G and G4 and positioned between the spacing plates E5 are a plulrality of irregularly shaped Geneva wheels, those on shaft G being indicated as G8 and those on the shaft G4 being indicated as G10. These Geneva elements rotate freelyabout their respective shafts within a predetermined range. Movement is permitted about their respective shafts and keys by the slots G11 in the wheels G8 and the slots G12 in the wheels G10.

The movement of the relative Geneva members and the spacing of parts which permits the movement are as follows: Figure 4 indicates the Y parts in starting position. In this position a Vconvex curved surface H on the member Gr8 is opposed to a corresponding concave curved surface H1 on the member G10. Further rotation of the member G5 in counter-clockwise direction is pre- K vented by the limit projection'H2. A projection Connecting the opposed end of the plates E1,

The; shaft of the rod E2 -is chan-` H3 on the member G10 is opposed. to a releasing projection A of the latch member A0. The racks A keep Ithe parts in the position in which they are shown in Figure 4 and will hold the latch A0 tilted up into about the position it is shown in Figure 4. Assume that the parts are moving in the direction of the arrow in Figure 4 and that one of the pattern pins B1 is depressed it will, as shown in Figure 4, be engaged by a projection HL1 of the member G5. As the assembly continues its movement toward the left, this will cause a rotation of the particular member G0, which is engaged by the pin into the position in which it is shown in Figure 5. This brings another projection H5 of the member G8 into engagement with the locking member A of the latch A0. This rotation in relation to the shaft G is permitted by the slot G11 which clears the key G3. Figure 6 illustrates the termination of this rotation of the member G8 with the latch firmly thrust down into latching position and with the tooth orl dog AF1 in engagement with one of the notches A1 of the bed. l This permits the projection H4 to clear the pin B1, so that the assembly can continue its movement to the left. Meanwhile the rotation of the member G8 has taken the convex surface H out of contact with the member G10 and has opposed to it the concave curved surface H5. This permits a counter-clockwise rotation of the member G10, whereby its rounded surface VI-Irl is opposed to the surface H5 and a further rotation of the member G10 is permitted, limited by the engagement of the slot G12 with the key. The projection H3 meanwhile still engages the projection A9 until, as further rotation continues, to the position shown in Figures 'l and 8. the member G10 has rotated so far as to clear the projection A9. This is necessary as the assembly continues the movement as a unit to the left but the particular matrix bar A5 and latch A6 are left motionless upon the bed. This happens individually as to each matrix strip and latch aligned with any pin B1 which happens to be depressed. It will be understood that a similar locking and unlocking mechanism is provided for each matrix strip. In case there is any tendency on the part of a given latch A6 to fail to reach its necessary bottom, latching position, the member or bar lilrl is provided with a flat lower surface E20 which rides on the upper surface of the member A10 and therefore thrusts it positively down into latching position. Also an inclined upper surface E21 of said member El acts as a cam surface to thrust the pin B1 back into inoperative position. This last mentioned action is clearly shown in Figure 6.

Positioned above the shaft G4 and also extending between and rotatable in the side plates E1 is a shaft I, which is cut away as at I1, between the side plates E1 to permit the rotation of the members G10. It is also provided with an outward extension or cam lever I2, which is adapted' to engage one of the earlier mentioned stops D9 D10.

- At the endV of the stroke, as shown in Figure 7,

this lever I2 engagesvthe stop D10, which causes a rotation of the shaft I, which moves the cut away portion I1 into the position in which it is` shown in Figures 'lA and 8. The shaft I then serves as a stop or lock for preventing clockwise rotation of the member G10 since, as shown in Figure 8, in that position the surface H0"of the member (Sr is opposed to the surface H1 of the member G10, the immobilization of the member G10 pre.- vents any rotation of the member G2. The parts are all locked in this position 'with no partsv projectng upwardly enough to engage any pin of the pattern bed which may in the meantime have been again depressed for the next cycle. Figure '7 represents the position of the parts at the end of the stroke, with the cam. plate C3 in engagement with the end stop' C15. The cam plate during the forward stroke had projected substantially forwardly of the side plates E1`but the engagement of the cam plates with the stops C limited further movement of the cam plates, the side plates E1 meanwhile continuing their forward movement until the parts reach the position in which they areV shown in Figure 7. The eiect of the relative movement of the cam plates C3 with the side plates E1 is to tilt the entire assembly clown from the position in which it is shown in Figure 6 to the position in which it is shown in Figures '7 and 8. The side plates E1, as earlier mentioned, can tilt or rotate about the pins E. It will be understood that during the forward movement as indicated by the direction of the arrows in Figures 1 and 4, the projections D on the brackets C2 engage the dogs D1 of the cam plates C3 and draw the' cam plates forward'. Toward the end of the stroke, when the parts reach the position of Figure 7, the dog D1 is engaged by the stop D0 and is given thereby a clockwise rotation against the spring D3. This permits it to clear the projection D and, the cam plate having reached the end of its movement and being in engagement with the stop C15, the further movement of the racks C draws the whole assembly forward until the side plates E1V are in the position in which they are shown in Figure 7. Meanwhile this forward movementof the side plates E1 in relation to the cam C3 causes a downward tilting of the right hand end of the side plates E1 and their associated parts, referring to the position of the parts in which they are shown in Figure '7. This tilting is caused by the extension ofreduced portions E15 of the tie rod E7 in the cam slot C5. The final terminal position of all the parts is indicated in Figure "iV ready for the beginning of the retrograde movement.

Assume the beginning of the return stroke with the racks CC1 moving toward the right. The projection D enga-ges the dog D2 and the entire assembly begins to move to the right in the direction of the arrow of Figure 8. This movement continues until the assembly beginsvv to contact the latch members A0. Such acontact is indicated inFigure 8'. A lower cam facev E22 of the member El engages the portion A0 of the latch A5 and rotates it to unlatched position withdrawing the tooth A", as shown in Figure 8. Then the projection E23 engages the projection A11 of the matrix bar and draws the matrix bar to the right along the bed toward its original position. The various matrix bars are successively freed and picked up in this manner, until the entire battery of bars is moving toward the right. When the assembly approaches its end position the cam plates C3 engage the stops C1A1 and their further movement is ended. At about the same time the dog D2 strikes the stop DI and is lifted to permit the projection D20 to clear, whereby the rest of the assemblyl can move, in relation to the cam plates C3 from the position as shown in Figure 8 back to the original position of Figure l. Just previously the lever I2 of the shaft I also engages the cam abutment D9 and is rotated thereby counter'- in Figure 1.

4 clockwise into vunlocking position, Vwhereby rotation of the Ymember G10 is made possible. In

other words, the locking function of the shaft engaging the cam roller G7 of the lever G5, which imparts movement to the shaft G4. K2 indicates a cam arm which engages the cam roller G2 on the lever G1, which in turn imparts rotation to the shaft G. K3 indicates a curved or non-,camming portion, which is shown as opposed to the roller G2 in Figure 9. On one sideof the member K is a roller Kopposed to the lug C15 and on the other is a roller K5 opposed to the lug C17. With the parts moving to the right, in the direction of the arrow of Figure 9, the roller K4 engages the stop C10 and causes a clockwise rotation of the member K. This causes a clockwise rotation of the shaft G4, the shaft G meanwhile beingv not rotated because of the opposition of the curvature K3 to the roller G2. This rotation of the shaft G4 returns the member G to its initial position as shown in Figure 4, the member G8 being also rotated, when the roller G2 engages the inclined face of the member K2, after the member G10 has been set in its position. This ensuing rotation of the shaft G returns the member G8 to itsl original position as shown in Figure 4. Thus the entire assembly is back ini initial or reset position. The final position is as shown stroke the roller K5 is opposed to the stop C17 and causes a rotation of the member K into the position in which `it is shown for example in Figure 9. This also rotates the` shafts G and G4 but this rotation has no effect upon the position of the members G10 and G0, Ybecause this rotation is within the limit permitted by the slots G11 G12. The purpose is merely to put 0 the member K into position ready for its resetting function when the assembly again returns to the end of the resetting stroke. Note that the spacing plates E6 are cut away as at G14 and y G15 to clear the keys G3 G5 during rotation of their respective shafts G and G4.

It will be realized that Whereas I have described and shown a practical and operative device, nevertheless many changes may be made invsize, shape, number and disposition of parts without departing from the spirit of.my invention. IV wish my description and drawings to be taken therefore in a broad sense illustrativev and diagrammatic rather than as limiting me to the precise details described and shown. It will be realized for example that my invention f may be applied to a variety of `uses and its application to use with a pattern bed or for use with matrix strips is intended to be illustrative rather than limiting, except so far as I precisely limit myself by the language of my claims.

Broadly stated, the use and oper tion of the vinvention are as follows:

Assume it to be applied to a type casting ,machine for casting type in response to location At the beginning of the ensuing of pattern members'. I provide an overlying pat-I tern bed B2in which'are positioned'a plurality for casting type. I find it convenient for example to employ an ordinary commercial typewriter with any suitable mechanism for depressing the pins B in response to actuation of typewriter keys. Such a structure is shown for example in my Patent No. 1,775,822 issued September 16, 1930. Each matrix strip may have in it impressions corresponding to all the characters of the typewriter. This is preferable but not essential. Assume that the operatorhas Written a line of type. 'I'he result is the' depression of a plurality of pins, no more than one pin for eachmatrix strip. When all the pins for the entire line of type have been depressed, the operator then moves the racks C C1 to the left. As each pin is reached itk causes, through the mechanism above described, the depression of the latch Afifor any particular matrix strip. Whereas, at the beginning of the stroke, all the matrix strips move in response to actuation of the racks YC C1, each pin causes one of the matrix the depression of the latch A5 into latching position. The Vsuccessive matrix strips are thus successively anchored in place on the matrix bed. Where no pin is depressed, the matrix strip moves to the end of the excursion and no -type impression it cast from it. Whereas it will be understood that the casting mechanism does not form part of the present invention and is not shown at all, I nd it `practical to employ a'cast'- ing slot or member whereby, along a given alignment, metal is projectedagainst thenatrix strips to cast a line of type. After the line is cast, the operator then moves the racks A5 to the right and the pick up mechanism operates as above set out in detail, the matrix strips being picked up one by one and returned to the initial position. f

I claim:

l. In combination, a supporting bed,-a plurality of strips longitudinally movable upon said bed, a latch member associated with each strip and adapted for latching cooperation with said bed, a pattern bedV positioned above said strips,

'pattern elements in said bed, and actuating means for imparting longitudinal movement to the strips, including an actuating carriage and members, rotatably mounted on said carriage, and additional members, rotatably mounted on said rstr 2. In combination, a supporting bed, a plurality Y of strips longitudinally movable upon said bed,

a latch member associated with each strip and` adapted for latching cooperation with said bed,A

a pattern bed positioned above said strips, pattern elements'in said bed, actuating means for imparting` longitudinal movement to the strips, including an actuating carriage, and a plurality of sub-frame members rotatably mounted on said carriage, and vmembers rotatably mounted upon said sub-frame members, adapted, in response to contact with said pattern elements, to rotate said latch members into latching position in relation to said supporting bed.

3. In combination, a supporting` bed, a member longitudinally movable upon said bed, a latch associated With said memberY and adapted for latching cooperation with the bed; and means for actuating said latch in response to endvvise'movement of said member, includingan actuating carriage, a `sub-frame pivoted on said` carriage and a cam plate, normally movable With said carriage, and a camming connection'betvveen said plate and said sub-frame, adapted to tilt said sub-frame in relation to said carriage, in response to relative movement of said carriage and cam plate.

4. In combination, a supporting bed, a member longitudinally movable upon said bed, a latch associated with said member and adapted for latching cooperation with the bed, and Vmeans for actuatingsaid latch in Vresponse to endwise 'movement of saidmember, including an actuating carriage, a sub-frame pivoted on said carriage and a cam plate, normally movable with said carriage, and a camming connection between said plate and said sub-frame, adapted to tilt said vsub-frame in relation to said carriage, in response to relative movement of said carriage and cam plate, and means for normally holding said cam plate and sub-frame against relative movement.

5. In combination, a supporting bed, a member longitudinally movable upon said bed, a latch associated with said member and adapted for latching cooperation with the bed, and means for actuating said latch in response to endwise movement of said member, including an actuating carriage, a sub-frame pivoted on said carriage and a cam plate, normally movable with said carriage, and a camming connection between said plate and said sub-frame, adapted to tilt saidsub-frame in relation to said carriage, in response to relative movement of said carriage and cam plate, and means for normally holding said cam plate and v 40 sub-frame against relative movement, and means for causing their relative movement adjacent the end of the excursion of said carriage.

6. In combination, a supporting bed, a member longitudinally movable upon said bed, a latch associated With` said member and adapted for latching cooperation with the bed, and means for actuating said latch in response to endWise movement of said member, including an actuating carriage, a sub-frame rpivoted on said carriage, means for normally holding it against movement in relation to said carriage, and means for causing it to rotate in relation to said carriage at a predetermined point in the excursion of the carriage.

7. In combination, a supporting bed, a. member longitudinally movable upon said bed, a latch associated with said member and adapted for latching cooperation with the bed, and means for actuating said latch in response to endWise movement of said member, including an actuating carriage, a sub-frame pivoted on said carriage, means for normally holding it against movement in relation to said carriage, and means for causing it to rotate in relation to said carriage at a predetermined point in the excursion of the carriage in one direction, means for causing it to rotate in relation to said carriage at a predetermined point in the excursion of the carriage in the opposite direction.

8. In combination, a supporting bed, a member longitudinally movable upon said bed, a latch associated with said member and adapted for latching cooperation With the bed, and means for actuating said latch in response to endwise movement of said member, including an actuating carriage, a sub-frame pivoted on said carriage,

means-for normally holdingjitagainst movement in relation to said carriage, and means for causingit to rotate in relation tofsaid carriage at' a predetermined point 'in thel excursiontof the carriage, and latch actuating means positioned. on

said sub-frame, and means for normally holding them against movement in' relation to said 'suba' frame.

9. 'In combination,` asupportingbed, a member fr longitudinally movable .upon said bed, a latchassociated with said-member and .adapted for latching cooperationvvith the bed,'and.means for actuating saidlatch in response to endwise movement` of said member, including an actuating-carri a .,.re,y a vsub-frame ,pivoted on. said carriage; Ameans for i normally holding it against movement Ain relation to said carriage', and means for causing it to rotate in relation to saidcarriageu at `a predetermined point in the -excursionoi'they carriage,andVl latch actuating means positioned onsaid subframe, and includinga pair of engaging Geneva v elements, and means for normally holding them against rotation in relation-to said sub-frame.`

lil. In combination, a supporting bed, a member longitudinally movable Aupon said bed, a latch associated With said member and adapted for latching'cooperation with the bed, and means for actuating said latch in response to endvvse movement of said member, including an actuatingcar ria-ge, aV sub-frame pivoted on said carriage, means for normally holdingit against movement in relation to said carriage, and means for causing it to rotate in relation to'said carriage at a predetermined point in the excursion of the carriage, and `latch actuating means positioned-onV said sub-frame, includingengaging Geneva elements, one of said-Geneva elements havinga` latching cooperation with the bed, andmeansiory actuating said latch in response to endvvise move-f mentfof-saidmemberv, including an actuatingcar- 5 soY riage, a sub-frame pivoted on said carriage, means Y for normally holding it against movement in relation to said carriage, and means for causing it to rotate in relation to said carriage at a predetermined point in the excursion of the carriage, and latch actuating means positioned on said subirame, including engaging Geneva elements, one of said Geneva elements having a cam portion adapted to engage an opposed cam portion of the latch and, when rotated, to thrust the latch into latching position, the other Geneva element including a portion adapted to engage an opposed portion of the latch and to hold the latch in unlatched position.

l2. In combination, a supporting bed, a member longitudinally movable upon said bed,'a latch associated With said member and adapted for latching cooperation with' the bed, and means for actuating said latch in response to endwise movement of said member, including an actuating carriage, a sub-frame pivoted on said carriage, means for normally holding it against movement in relation to said carriage, and means for causing it to rotate in relation to said carriage at a' tion of the latch and, when rotated, to thrust the latch into latching position, the other Geneva element including a portion adapted to engage an opposed portion of the latch and to Vhold the latch in unlatched position, astop member positionedab'ove the supporting bed and the longitudinallymovable member and adapted to engage the rst mentioned of said Geneva members and to rotate it into latch actuating position in response to a movement of the actuating carriage and sub-frame in one direction.

13.1' In combination, a supporting bed, a mem- Y ber longitudinally movable upon said bed, a. latchV associated `with said member and adapted kfor latching cooperation with the bed, and means for f actuating said latch in response to endwise movefmentfof'said member,including an actuating carriage, a sub-frame pivoted on said carriage, means Vfor normally holding it against movement inY relation to said carriage, and means for causing vit to rotate in relation to said carriage at a predetermined point in the excursion of the carriage, and latch actuating means positioned' on said sub-frame, including engaging Geneva elements, one of said Geneva elements havinga camV portion adapted to engage an opposed cam portion of the latch and, when rotated, to thrust the latch,y into latching position, the other Geneva Velement including a portion adapted to engageY an opposed Vportion of the latch and to hold the latch in unlatched position, a stop member positioned above the supporting bed and the longi.- tudinally movable member and adapted to en-V ber longitudinally` movable upon said bed, a latchV associated with said member and adapted for latching cooperation with the bed, and means for actuating said latch in response Yto endwise movement of said member, including an actuating carriage, a sub-frame associated with said carriage, Y

riage.

a pair of engaging Geneva members rotatably mounted on said sub-frame, shafts on which said Geneva members are rotatably mounted, limitmembers on `said shafts, said Geneva members being provided with segmental apertures in which said limit members are adapted tovmove.V

15. kIn combination, a supporting bed, a mem'- ber longitudinallymovable upon said bed, and

means formoving it, a latch associated with saidr member and adapted for latching cooperation with said bed,'and means for actuating said latch in response to endwise movement of said member,

including an actuating carriage, kan intermediate member pivoted to said carriage, rotatable latch actuating means mounted upon said intermediate member, and means for actuating said means'in response to endwise movement of said carriage;

16. In combination, a supporting bed, a member longitudinally movablefupon said bed, andr means'for moving it, a latch associated Vwith said member and adapted Vfor latching cooperation with said bed, and means for actuating said latch in response to endwise movement of said member including an actuating carriage, an intermediate member pivoted to said carriage, rotatable latch Vactuating means mounted upon said intermediate member, means for actuating said means in responseto endwise movement of said carriage,

and. independent means for rotating said inter-KI mediate member in relation to said carriage.

17. In combination, a supporting bed, a member longitudinally movable upon saidl bed, and means for moving it, a latch associated with said member and adapted for latching cooperation with said bed, and means for actuating said latch in response to endwise movement of said memberV including an actuating carriage, an intermediate.

member pivoted to said carriage, rotatable latch actuating means mounted upon said intermediate. member, means for actuating saidfmeans in response to endwise movement of said carriage, and

independent means for rotating said intermediate member in relation to said, carriage, including camming means normally movable with said car- CHESTER A. MAooMIc. 

